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first disconnect the battery then check how the serpentine belt is lined up so u can take it off and put back on. Then the pump should be on the side of the motor with 9or12 bolts there could be more! after taking out take razorblad and skrap the old gasket clean wipe of then put new gasket and pump back on dont over tighten the screws cuase the pump my be aluminum.

The problem is the crankshaft sensor for sure. It is mounted behind the crankshaft pulley which is pretty difficult to get off as you need a special puller. A shop should charge about 1.5 hours for this job. It is a very common problem.

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Related Questions:

It's not the BCM. The BCM doesn't affect the ignition switch power. But the ignition switch will affect the BCM. I would look to see why you don't have power to the ignition switch first. Fuse or wire.

The only way for the blower to still get power with the key off...means the resistor to the blower motor is bad...The resistor is located on the firewall...under the plastic shroud...this should fix your problem...nice Buick...:)

Technically it is called a "SPAR" Control Module" some folks call it ECM even an "Ignition Control Module" when asking for the new part a new guy will have troble finding by the more common names.... of course nothing beats experience(wink)